[1] Univ Southampton, Sch Med, Canc Sci Unit, Southampton, Hants, England
[2] Univ Hosp Southampton, Div Surg, Southampton, Hants, England
[3] Univ Texas MD Anderson Canc Ctr, Dept Expt Therapeut, Houston, TX 77030 USA
[4] Univ Porto, Inst Invest Saude, P-4100 Oporto, Portugal
[5] Univ Porto, Inst Biomed Engn, P-4100 Oporto, Portugal
[6] Univ Texas MD Anderson Canc Ctr, Ctr RNA Interference & Noncoding RNAs, Houston, TX 77030 USA